298 GEOLOGY OF OHIO. 



36. VERRUCARIA Pers. 



Verrucaria muraeis Ach. 



Limestone rock, Plain City (Madison Co.) W. C. Werner. 



Verrucaria nigrescens Pers. 



"On rocks," near Cincinnati, Thos. G. Lea (Cat.) 



Verrucaria rupestris Schrad. 



On limestone rocks, Muskingum Co., Wm. C. Werner; on rock, Ashtabula Co.> 

 E. E. Bogue. 



37. PYRENULA. 



Pyrenuea gemmata (Ach.) Naeg. 

 On Beech, Oberlin, E. E. Bogue. 



Pyrentula geabrata (Ach.) Mass. 



On old bark, Rendville (Perry Co.) , Fairfield Co., W. A. Kellerman ; Champaign 

 Co., Wm. C. Werner. 



PYRENUEA NITIDA Ach. 

 On bark, common. 



